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Full Discussion: Auto-exit from telnet prompt
Top Forums UNIX for Dummies Questions & Answers Auto-exit from telnet prompt Post 302507399 by Corona688 on Wednesday 23rd of March 2011 06:05:01 PM
Old 03-23-2011
Making it quit once it connects at least might be more doable. Redirect standard input from /dev/null. It will try to read from stdin once it connects, get EOF, and quit normally.

telnet doesn't seem to have any timeout options. It's a pain in general to automate. You'll have to kill it externally.

Code:
telnet hostname port < /dev/null > /dev/null &
PID=$!

sleep 3
# Can't kill something that's dead, so if telnet's finished already
# killing it won't change its exit status from zero to nonzero.
kill "$PID"
if ! wait
then
        echo "No telnet"
fi

Is netcat (nc) available? It has timeouts and such, and doesn't depend on terminals, so is much less torturous to automate.
 

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telnetrc(4)						     Kernel Interfaces Manual						       telnetrc(4)

NAME
telnetrc, .telnetrc - Specifies setup commands for a telnet session SYNOPSIS
$HOME/.telnetrc DESCRIPTION
The .telnetrc file contains the setup information for a telnet session. It is a hidden file in your home directory and must be readable by the user logging in. The file can consist of multiple entries for each remote host to which a user can connect. A remote host entry consists of multiple lines. The first line is the name of a remote host. The subsequent lines must begin with blank spaces, and contain telnet subcommands. These sub- commands are processed as though they were typed in manually. Lines beginning with a number sign (#) are comment lines. See telnet(1) for a complete list of telnet subcommands. To specify subcommands that apply to all systems, create an entry, using the word "DEFAULT" as the system name, and specify the telnet sub- commands in the subsequent lines. EXAMPLES
The following shows a sample .telnetrc file: # Beginning of telnetrc file # Default subcommands that apply to all systems DEFAULT environ undefine USER # First system entry system1 set echo toggle crlf # Second system entry system2 set echo mode line toggle crlf FILES
User-customized telnet startup values. RELATED INFORMATION
Commands: telnet(1). delim off telnetrc(4)
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